Customizing Sphider search page


I have start using a search engine script for searching within a website called sphider.
I have stuck in integrating of the search box.

This engine offers a search.php page. I want to integrate this search.php page within a div. I want to adapt this search.php page to reducing it to a search box.

I have tried to do that with the include php function with no result. The search.php is not displayed at all.

Please help me with this thing and please ask me for details if is the case.

Thank you.